Koeleria pyramidata

(Lam.) P. Beauv.
Common names: Crested hairgrass
Introduced
Treatment appears in FNA Volume 24. Treatment on page 754.
Please click on the illustration for a higher resolution version.
Illustrator: Cindy Roché

Copyright: Utah State University

Plants loosely cespitose, sometimes rhizomatous. Culms (30) 40-90 cm, glabrous or puberulent above. Sheaths sparsely sericeous to densely pubescent, old sheaths persistent, disintegrating into wavy, curled, or arched fibers; ligules 0.5-1 mm; blades 5-24 cm long, 1-5 mm wide, flat, margins of the basal blades often ciliate below, with hairs usually longer than 2 mm. Panicles 5-22 cm long, 1-4 (5) cm wide; branches villous. Spikelets 6-10 mm, with 2-4 (5) florets; rachillas with scattered pubescence. Glumes acute, glabrous, smooth or scabrous; lower glumes 4-5 mm, 1-veined; upper glumes 5-6.5 mm, 3-veined; calluses broadly rounded, pubescent; lemmas 4-6 mm, glabrous or puberulent, rarely ciliate, usually green when young, stramineous at maturity, apices acuminate to shortly aristate; anthers 2-2.5 mm. Caryopses 2.5-3.8 mm. 2n = 14.

Discussion

Koeleria pyramidata, as interpreted here, is confined to Europe. Some North American records for K. pyramidata are based on robust specimens of K. macrantha; others reflect an interpretation of K. pyramidata that includes K. macrantha.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Koeleria pyramidata"
membranous +  and scarious +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
acuminate +  and shortly aristate +
Lisa A. Standley +
(Lam.) P. Beauv. +
1 (?) +  and 3 (?) +
straight +
basal +  and terminal +
keeled +  and rounded +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
5 cm50 mm <br />0.05 m <br /> (24 cm240 mm <br />0.24 m <br />) +
not evident +
glabrous +  and pubescent +
flat +  and involute +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
spikelike +
Crested hairgrass +
not branching +
puberulent +  and glabrous +
40 cm400 mm <br />0.4 m <br /> (90 cm900 mm <br />0.9 m <br />) +
not woody +
Wash. +, Del. +, Wis. +, Pacific Islands (Hawaii) +, Maine +, Vt. +, Wyo. +, N.Mex. +, Tex. +, La. +, N.Y. +, Pa. +, Alaska +, Nev. +, Colo. +, Calif. +, Ala. +, Kans. +, N.Dak. +, Nebr. +, Okla. +, S.Dak. +, Ark. +, Ill. +, Ind. +, Iowa +, Ariz. +, Idaho +, Md. +, Ohio +, Utah +, Mo. +, Minn. +, Mich. +, Mont. +, Miss. +, Ky. +, Alta. +, B.C. +, Man. +, N.W.T. +, Ont. +, Que. +, Sask. +, Yukon +  and Oreg. +
1/4 +  and 1/3 +
liquid +, soft +  and hard +
arched +, curled +  and wavy +
capillary +
pistillate +  and staminate +
sometimes longer +
2 +  and 4 +
sterile +  and bisexual +
compressed +
reduced +
shorter or longer +
subtending +
subequal +
membranous +
uncinate +
2 cm20 mm <br />0.02 m <br /> (?) +
pyramidal +  and spikelike +
stramineous +  and green +
puberulent +  and glabrous +
lanceolate +  and ovate +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
membranous +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
membranous +
inconspicuous +
somewhat narrower and shorter +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
concealed +  and prominent +
2 +  and 1 +
well-developed +
2-keeled +
subequal +
5cm +  and 22cm +
spikelike +
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
dry +  and fleshy +
pubescent +  and glabrous +
disintegrating +
persistent +
sparsely sericeous +  and densely pubescent +
Introduced +
1 +  and 60 +
compressed +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
1 +  and 3 +
simple +  and compound +
2 (?) +  and 3 (?) +
Gramineae +
Koeleria pyramidata +
Koeleria +
species +
membranous +
0.5 cm5 mm <br />0.005 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
parallel +  and converging +
plant +  and cespitose +
aquatic +  and terrestrial +